Zephaniah 1:6

Them that are turned back - Who have forsaken the true God, and become idolaters. Nor inquired for him - Have not desired to know his will.

This verse describes more comprehensively those guilty of defection from Jehovah in any way (Jer 2:13, Jer 2:17).

And them that are turned back from the Lord Who once were worshippers of him, but now become apostates, and had turned their backs on him and his worship. Some think this describes those who renewed their covenant with God in Josiah's time, and after that revolted from him, who must be very abominable to him; and therefore he threatens to stretch out his hand, and pour out his wrath upon them: and [those] that have not sought the Lord, nor inquired for him; profane abandoned sinners, that lived without God in the world, and as if there was no God; never concerned themselves about the worship of him, having no faith in him, love to him, or fear and reverence of him; so far were they from seeking him in the first place diligently, zealously, and with their whole heart, that they never sought him at all; nor took any pains to get any knowledge of him, or of his mind and will, and manner of worship; but were altogether careless about these things, and unconcerned for them.

Judgment upon All the World, and upon Judah in Particular - Zephaniah 1 The judgment will come upon all the world (Zep 1:2, Zep 1:3), and will destroy all the idolaters and despisers of God in Judah and Jerusalem (Zep 1:4-7), and fall heavily upon sinners of every rank (Zep 1:8-13). The terrible day of the Lord will burst irresistibly upon all the inhabitants of the earth (Zep 1:14-18).

After the title of the book (Zep 1:1) here is, I. A threatening of the destruction of Judah and Jerusalem, an utter destruction, by the Chaldeans (Zep 1:2-4). II. A charge against them for their gross sin, which provoked God to bring that destruction upon them (Zep 1:5, Zep 1:6); and so he goes on in the rest of the chapter, setting both the judgments before them, that they might prevent them or prepare for them, and the sins that destroy them, that they might judge themselves, and justify God in what was brought upon them. 1. They must hold their peace because they had greatly sinned (Zep 1:7-9). But, 2, They shall howl because the trouble will be great. The day of the Lord is near, and it will be a terrible day (Zep 1:10-18). Such fair and timely warning as this did God give to the Jews of the approaching captivity; but they hardened their neck, which made their destruction remediless.